62 



Fishery Bulletin 90(1). 1992 



Pterygoid), W. Internal Nares, W. Premax. (at 1/2 L.), 

 and W. Rostrum (at Base)— that, in combination, were 

 best for discriminating among blocks (based on canon- 



ical variates analysis reported below). With a w -value 

 of 1.79, block 0702 is separated from the remaining 

 blocks. Note that four groups were formed when using 

 a 1.47 w-value; there are two single-block groups (i.e., 

 0702 and 0802). When the w -value was lowered to 1.37, 

 the same groups were formed, except that 0315 was 

 in its own group and 0802 joined with a group of 

 predominantly southern localities. With a 1.26 M^-value, 

 the clusters are the same except that block 0505 joins 

 the northeastern blocks instead of those from the south. 

 Three groups were formed with a 1.15 w-value: (1) 

 block 0702; (2) a group of eight blocks, including south- 

 ern blocks in addition to 0508, 0505, and 0802; and (3) 

 the northern and eastern blocks, including 0411 and 

 0417, as well as 0506, 0507, and 0509. At smaller 

 w -values, there is further subdivision. 



A canonical variates analysis, using as initial data the 

 information on all 30 measurements for 25 blocks, in- 

 corporated the five characters listed in Table 4. A two- 

 dimensional plot of the 25 block centroids on canonical 

 variables 1 and 2 is included as Figure 7; although not 

 used to generate the axes, 10 blocks with only single 

 specimens also are projected onto these variables. The 

 geographic pattern of canonical variable 1 is depicted 

 in Figure 8B. The eigenvalue for canonical variable 1 

 is 2.93 and that for the second is 0.55, with the two 

 summarizing 82.0% of the variance for the five char- 

 acters. These five characters in combination show the 



Figure 6 



Modified skyline diagrams for 25 blocks, indicating 

 groups formed using function-point clustering pro- 

 cedures and based on: (A) all 30 characters; (B) five 

 characters that, in combination, best discriminate 

 among blocks (Postorbital W, L. Rostrum [frm. 

 Pterygoid], W Internal Nares, W. Premax. [at 1/2 

 L.], and W Rostrum [at Base]). For given w-va.\ue 

 (i.e., row), blocks connected in common line are in 

 same cluster. 



Table 4 



Canonical variates analysis of all specimens from 25 blocks. 



Character 



F- value to 

 enter 



Order of 

 entry 



Coefficients* 



1 



3 



4 



7 



10 



21 



L. Rostrum (frm. Pterygoid) 

 W Rostrum (at Base) 

 W Premax. (at 1/2 L.) 

 Postorbital W 

 W. Internal Nares 

 Constant 



4.53 

 2.38 

 2.30 

 23.21 

 2.88 



0.0242 (0.2830) 



-0.0603 (-0.1622) 



-0.0291 (-0.0393) 



0.2113 (0.8570) 



0.0958 (0.1870) 



38.9175 



* Unstandardized coefficients, with standardized values in parentheses, for canonical variates. 



-0.0662 (-0.7734) 

 -0.1912 (-0.5145) 

 0.2419 (0.3273) 

 0.0648 (0.2628) 

 0.3324 (0.6489) 

 4.4931 



